User Guide

Table Of Contents
Honeywell Installation 23
4
4.2.5 Stripping lengths of motor and mains cables
Figure 4.9: Stripping of cables
Note! Strip also the plastic cover of the cables for 360 degree grounding. See Fig-
ures 4.4, 4.5 and 4.8.
4.2.6 Cable installation and the UL standards
To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper ca-
ble with a minimum heat-resistance of 140/167 °F (+60/75 °C) must be used.
4.2.7 Cable and motor insulation checks
These checks can be performed as follows if motor or cable insulations are suspect-
ed to be faulty.
1. Motor cable insulation checks
Disconnect the motor cable from terminals U/T1, V/T2 and W/T3 of the frequency
converter and from the motor. Measure the insulation resistance of the motor cable
between each phase conductor as well as between each phase conductor and the
protective ground conductor.
The insulation resistance must be >1MOhm.
2. Mains cable insulation checks
Disconnect the mains cable from terminals L1, L2/N and L3 of the frequency convert-
er and from the mains. Measure the insulation resistance of the mains cable between
each phase conductor as well as between each phase conductor and the protective
ground conductor.The insulation resistance must be >1MOhm.
0.3 in
0.3 in
1.4 in
0.8 in
Ground conductor